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WO2010051530A2 - Compositions et procédés d'administration d'une substance à une cible biologique - Google Patents

Compositions et procédés d'administration d'une substance à une cible biologique Download PDF

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Publication number
WO2010051530A2
WO2010051530A2 PCT/US2009/062958 US2009062958W WO2010051530A2 WO 2010051530 A2 WO2010051530 A2 WO 2010051530A2 US 2009062958 W US2009062958 W US 2009062958W WO 2010051530 A2 WO2010051530 A2 WO 2010051530A2
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Prior art keywords
tetrazine
ligand
dienophile
agent
antibody
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PCT/US2009/062958
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WO2010051530A3 (fr
Inventor
Scott A. Hilderbrand
Neal K. Devaraj
Ralph Weissleder
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General Hospital Corp
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General Hospital Corp
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Priority to US13/126,660 priority Critical patent/US8900549B2/en
Priority to EP09824216.7A priority patent/EP2361098B1/fr
Priority to CN200980153250.6A priority patent/CN102271712B/zh
Priority to EP19193586.5A priority patent/EP3622968A1/fr
Publication of WO2010051530A2 publication Critical patent/WO2010051530A2/fr
Publication of WO2010051530A3 publication Critical patent/WO2010051530A3/fr
Anticipated expiration legal-status Critical
Priority to US13/761,838 priority patent/US20130302246A1/en
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/5306—Improving reaction conditions, e.g. reduction of non-specific binding, promotion of specific binding
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/54—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound
    • A61K47/555—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound pre-targeting systems involving an organic compound, other than a peptide, protein or antibody, for targeting specific cells
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6891—Pre-targeting systems involving an antibody for targeting specific cells
    • A61K47/6897—Pre-targeting systems with two or three steps using antibody conjugates; Ligand-antiligand therapies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K49/00—Preparations for testing in vivo
    • A61K49/001—Preparation for luminescence or biological staining
    • A61K49/0013—Luminescence
    • A61K49/0017—Fluorescence in vivo
    • A61K49/0019—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K49/00—Preparations for testing in vivo
    • A61K49/001—Preparation for luminescence or biological staining
    • A61K49/0013—Luminescence
    • A61K49/0017—Fluorescence in vivo
    • A61K49/0019—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules
    • A61K49/0021—Fluorescence in vivo characterised by the fluorescent group, e.g. oligomeric, polymeric or dendritic molecules the fluorescent group being a small organic molecule
    • A61K49/0041—Xanthene dyes, used in vivo, e.g. administered to a mice, e.g. rhodamines, rose Bengal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
    • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
    • A61K51/04—Organic compounds
    • A61K51/0474—Organic compounds complexes or complex-forming compounds, i.e. wherein a radioactive metal (e.g. 111In3+) is complexed or chelated by, e.g. a N2S2, N3S, NS3, N4 chelating group
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
    • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
    • A61K51/04—Organic compounds
    • A61K51/0495—Pretargeting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/531—Production of immunochemical test materials
    • G01N33/532—Production of labelled immunochemicals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides

Definitions

  • the present application provides compositions and methods using bioorthogonal inverse electron demand Diels-Alder cycloaddition reactions for rapid and specific covalent delivery of a "payload" to a ligand bound to a biological target.
  • Bioorthogonal "click” chemistries are widely used in chemical biology for a myriad of applications such as activity based protein profiling, crosslinking of proteins, monitoring cell proliferation, generation of novel enzyme inhibitors, monitoring the synthesis of newly formed proteins, protein target identification, and studying glycan processing.
  • intracellular live cell labeling requires reagents that can easily pass through biological membranes and kinetics that enable rapid labeling even with the low concentrations of agent that make it across the cell membrane. Additionally, a practical intracellular bioorthogonal coupling scheme would need to incorporate a mechanism by which the fluorescent tag increases in fluorescence upon covalent reaction to avoid visualizing accumulated but unreacted imaging probes (i.e. background). This "turn-on” would significantly increase the signal-to-background ratio, which is particularly relevant to imaging targets inside living cells since a stringent washout of unreacted probe is not possible.
  • the present invention provides methods and compositions based on a bioorthogonal inverse electron demand Diels-Alder cycloaddition reaction for rapid and specific covalent delivery of a "payload" to a ligand bound to a biological target.
  • the Diels-Alder reaction connects the two components of the reaction, a diene and a dienophile.
  • the diene and dienophile are each physically connected, e.g., through a linker, either to the payload or to a ligand that binds to the target.
  • This bioorthogonal chemistry platform can be used extracellularly or intracellularly, in vivo or in vitro.
  • the methods and compositions described herein include using inverse electron demand Diels-Alder cycloaddition chemistry to chemically couple a diene with a dienophile.
  • the diene is a heteroaromatic ring system containing two adjacent nitrogen atoms.
  • the diene is a substituted tetrazine.
  • the diene is a heteroaromatic ring system containing adjacent nitrogen atoms whereby the bioconjugation releases dinitrogen.
  • the dienophile is an alkene such as ethylene, propylene or other straight chain alkene. In some embodiments, the dienophile is an internal alkyne, terminal alkyne, or cyclic alkyne such as cyclooctyne. In some embodiments, the alkene is a strained alkene such as norbornene or trans-cyclooctene.
  • the invention features a target specific ligand, such as an antibody with a functional group (such as an amine, an alcohol, a carboxylic acid or ester) which can be chemically coupled to a small organic molecule such as trans- cyclooctenol containing a reactive moiety (such as an amine, an alcohol, a carboxylic acid or succinimidyl ester) available for coupling to the antibody, and a dienophile such as an alkene, carbonyl, nitroso, or imine available for reaction with a tetrazine in a Diels-Alder reation.
  • a functional group such as an amine, an alcohol, a carboxylic acid or ester
  • a reactive moiety such as an amine, an alcohol, a carboxylic acid or succinimidyl ester
  • the invention includes compositions for delivering an agent
  • compositions include a first component attached to a ligand that is specific for the biological target; and a second component attached to the agent, wherein the first and second components are each selected from either a diene or a dienophile and are reactants for the inverse electron demand Diels-Alder reaction.
  • first component is a diene
  • second is a dienophile
  • the term "attached to” includes chemical linkages, e.g., via a reactive group or a linker, as well as incorporation of the diene or dienophile into the ligand or agent, e.g., as a non-natural amino acid or nucleoside.
  • the agent is a detectable agent
  • the detectable agent can be selected from the group consisting of organic small molecules, inorganic compounds, nanoparticles, enzymes or enzyme substrates, fluorescent materials, luminescent materials, bioluminescent materials, radioactive materials, and contrast agents.
  • the detectable agent is linked to a diene, and undergoes fluorogenic activation in the presence of the strained dienophile (i.e., is not fluorescent or weakly fluorescent in the absence of the dienophile, and becomes more strongly fluorescent in the presence of the dienophile upon completion of the Diels- Alder reaction).
  • the agent is a therapeutic agent
  • the therapeutic agent can be, e.g., a small molecule, enzyme inhibitor, receptor protein inhibitor, small interfering RNA (siRNA), cytotoxin, radioactive ion, or other therapeutic agent.
  • the invention provides methods of delivering a detectable agent to a biological target.
  • the methods include contacting a biological target with a ligand, wherein the ligand is linked to a first component selected from either a diene or a dienophile, to form a ligand-target conjugate; contacting the ligand-target conjugate with a second component that is selected from either a diene or a dienophile and participates in an inverse electron demand Diels-Alder reaction with the first component, and wherein the conjugate is also linked to a detectable agent; under conditions and for a time sufficient time for the first and second components to undergo an inverse electron demand Diels-Alder reaction, thereby delivering the detectable agent to the target.
  • the detectable agent is selected from the group consisting of organic small molecules, inorganic compounds, nanoparticles, enzymes or enzyme substrates, fluorescent materials, luminescent materials, bioluminescent materials, radioactive materials, and contrast agents.
  • the methods further include detecting the detectable agent, e.g., using histochemistry, fluorescence detection, chemiluminescence detection, bioluminescence detection, magnetic resonance imaging, nuclear magnetic resonance imaging, X-ray imaging, X-ray computed tomography, ultrasound imaging, or photoacoustic imaging.
  • detecting the detectable agent e.g., using histochemistry, fluorescence detection, chemiluminescence detection, bioluminescence detection, magnetic resonance imaging, nuclear magnetic resonance imaging, X-ray imaging, X-ray computed tomography, ultrasound imaging, or photoacoustic imaging.
  • the biological target is in or on a live or dead cell, tissue section, or organism. In some embodiments, the biological target is in an in vitro assay.
  • the invention features methods for delivering a therapeutic agent to a biological target.
  • the methods include contacting a biological target with a ligand, wherein the ligand is linked to a first component selected from either a diene or a dienophile, to form a ligand-target conjugate; contacting the ligand-target conjugate with a second component that is selected from either a diene or a dienophile and participates in an inverse electron demand Diels-Alder reaction with the first component, and wherein the conjugate is also linked to a therapeutic agent; under conditions and for a time sufficient for the first and second components to undergo an inverse electron demand Diels-Alder reaction, thereby delivering the therapeutic agent to the target.
  • the therapeutic agent is a small molecule, enzyme inhibitor, receptor protein inhibitor, small interfering RNA (siRNA), cytotoxin, radioactive ion, or other therapeutic agent.
  • the cytotoxin is selected from the group consisting of taxol, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, actinomycin D, 1- dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, puromycin, maytansinoids, and analogs or homologs thereof.
  • the radioactive ion is selected from the group consisting of iodine 125, iodine 131, strontium 89, phosphorous, palladium, cesium, iridium, phosphate, cobalt, yttrium and praseodymium.
  • the therapeutic agent is selected from the group consisting of antimetabolites, alkylating agents, anthracyclines, antibiotics, and antimitotic agents.
  • Figure 1 shows embodiments in which a dienophile is linked to the ligand and a diene is linked to the payload, and an embodiment in which a diene is linked to the ligand and a dienophile is linked to the payload.
  • Figure 2 shows the inverse electron demand Diels-Alder reaction employing a diene (substituted tetrazine) and a dienophile (alkene or alkyne).
  • Figure 3 shows the inverse electron demand Diels-Alder cycloadducts, dye- tetrazine conjugate and ⁇ r ⁇ ws-cyclooctenol and the cycloaddition product.
  • Figure 4 shows the absorption and emission spectra of the dye-tetrazine conjugates before and after cycloaddition to ⁇ r ⁇ r ⁇ -cyclooctenol.
  • Figure 5 is a table listing the photophysical properties of the dyes before and after reaction.
  • Figure 6A shows the structure of Taxol® and the structure of the trans- cyclooctene taxol analog.
  • Figure 6B shows the comparison of the ability of taxol, trans-cyclooctene taxol, and a DMSO control to polymerize tubulin in the absence of GTP.
  • Figure 6C shows microtubule bundles formed in the presence of trans- cyclooctene taxol treated with tetrazine-BODIPY FL and visualized by fluorescence microscopy.
  • the present invention is directed to compositions and methods for delivering a "payload," such as a therapeutic or detectable agent, to a biological target.
  • a "payload" such as a therapeutic or detectable agent
  • These methods include the use of bioconjugation using bioorthogonal chemistry such as the inverse electron demand Diels-Alder reaction to deliver a payload, such as a therapeutic or detectable compound, using specific ligands such as antibodies, small molecules and other biomolecules.
  • the specific ligand is attached, optionally through a linker, to one component of the Diels-Alder pair, and the payload is attached, also optionally through a linker, to the other component.
  • the payload is attached to a dienophile
  • the payload is attached to the diene.
  • the methods and compositions can be used, e.g., in vivo and in vitro, both extracellularly or intracellularly, as well as in assays such as cell free assays.
  • the methods and compositions described herein can be used to deliver a payload to any biological target for which a specific ligand exists or can be generated.
  • the ligand can bind to the target either covalently or noncovalently.
  • Exemplary biological targets include biopolymers, e.g., proteins, nucleic acids, or polysaccharides; exemplary proteins include enzymes, receptors, ion channels, Other exemplary targets include small molecules, e.g., lipids, phospholipids, sugars, peptides, hormones, or neurotransmitters.
  • the target is a tissue- or cell-type specific marker, e.g., a protein that is expressed specifically on a selected tissue or cell type.
  • the target is a receptor, such as, but not limited to, plasma membrane receptors and nuclear receptors; more specific examples include ligand-gated ion channels, G-protein-coupled receptors, and growth factor receptors.
  • the receptor is an epidermal growth factor receptor (EGFR).
  • a ligand can be any compound, such as a small molecule or biomolecule (e.g., an antibody or antigen-binding fragment thereof), that binds specifically to a selected target, and can be functionalized by the addition of a diene or dienophile optionally via a linker.
  • a small molecule or biomolecule e.g., an antibody or antigen-binding fragment thereof
  • antibody refers to an immunoglobulin molecule or immunologically active portion thereof, i.e., an antigen-binding portion.
  • immunologically active portions of immunoglobulin molecules include F(ab) and F(ab') 2 fragments, which retain the ability to bind antigen.
  • F(ab)2 fragments can be generated by treating the antibody with an enzyme such as pepsin, a non-specific endopeptidase that normally produces one F(ab)2 fragment and numerous small peptides of the Fc portion.
  • the resulting F(ab)2 fragment is composed of two disulfide-connected Fab units.
  • Fc fragment is extensively degraded and can be separated from the F(ab)2 by dialysis, gel filtration or ion exchange chromatography.
  • F(ab) fragments can be generated using papain, a nonspecific thiol-endopeptidase that digests IgG molecules, in the presence of a reducing agent, into three fragments of similar size: two Fab fragments and one Fc fragment.
  • papain is the enzyme of choice because it yields a 50,00 Dalton Fc fragment; to isolate the F(ab) fragments, the Fc fragments can be removed, e.g., by affinity purification using protein A/G.
  • kits are available commercially for generating F(ab) fragments, including the ImmunoPure IgGl Fab and F(ab') 2 Preparation Kit (Pierce Biotechnology, Rockford, IL).
  • commercially available services for generating antigen-binding fragments can be used, e.g., Bio Express, West Riverside, NH.
  • the antibody can be a polyclonal, monoclonal, recombinant, e.g., a chimeric, de-immunized or humanized, fully human, non-human, e.g., murine, or single chain antibody.
  • the antibody has effector function and can fix complement.
  • the antibody has reduced or no ability to bind an Fc receptor.
  • the antibody can be an isotype or subtype, fragment or other mutant, which does not support binding to an Fc receptor, e.g., it has a mutagenized or deleted Fc receptor binding region.
  • binding portions of such antibodies include Fab fragments, F(ab')2 fragments, and Fv fragments.
  • Fab fragments include Fab fragments, F(ab')2 fragments, and Fv fragments.
  • F(ab')2 fragments include Fab fragments, F(ab')2 fragments, and Fv fragments.
  • These antibody fragments can be made by conventional procedures, such as proteolytic fragmentation procedures, as described in J. Goding, Monoclonal Antibodies: Principles and Practice, pp. 98-118 (N.Y. Academic Press 1983).
  • Chimeric, humanized, de-immunized, or completely human antibodies are desirable for applications which include repeated administration, e.g., therapeutic treatment of human subjects.
  • the antibody can also be a single chain antibody.
  • a single-chain antibody (scFV) can be engineered (see, for example, Colcher et al, Ann. N. Y. Acad. Sci. 880:263-80 (1999); and Reiter, Clin. Cancer Res. 2:245-52 (1996)).
  • the single chain antibody can be dimerized or multimerized to generate multivalent antibodies having specificities for different epitopes of the same target protein.
  • the antibody is monovalent, e.g., as described in Abbs et al., Ther. Immunol. l(6):325-31 (1994), incorporated herein by reference.
  • the antibody binds specifically to a tumor antigen, or to an antigen present in a tissue in which a tumor is present.
  • a number of antibodies against cancer-related antigens are known (Ross et al., Am J Clin Pathol 119(4):472- 485, 2003).
  • Examples include Alemtuzumab (Campath); Daclizumab (Zenapax); Rituximab (Rituxan); Trastuzumab (Herceptin); Gemtuzumab (Mylotarg); Ibritumomab (Zevalin); Edrecolomab (Panorex); Tositumomab (Bexxar); CeaVac; Epratuzumab (LymphoCide); Mitumomab; Bevacizumab (Avastin); Cetuximab (C- 225; Erbitux); Edrecolomab; Lintuzumab (Zamyl); MDX-210; IGN-101; MDX-010; MAb, AME; ABX-EGF; EMD 72 000; Apolizumab; Labetuzumab; ior-tl; MDX-220; MRA; H-11 scFv; Oregovomab; huJ591 MAb
  • Small molecules are low molecular weight organic compounds (less than 2000 Daltons). Small molecules useful in the compositions and methods described herein bind with high affinity to a biopolymer, such as protein, nucleic acid, or polysaccharide, or other biological target. Useful small molecules are capable of being functionalized with a dienophile or a diene.
  • a small molecule can be an agent such as taxol, which binds specifically to microtubules and is capable of being functionalized with a dienophile such as ⁇ r ⁇ r ⁇ -cyclooctene or another alkene.
  • Other examples include small molecules that bind specifically to receptors for hormones, cytokines, chemokines, or other signaling molecules.
  • Biomolecules are organic molecules produced by living organisms, including large polymeric molecules such as proteins, polysaccharides, and nucleic acids as well as small molecules such as primary metabolites, secondary metabolites, and natural products. Specific small molecule examples include, but are not limited to, estradiol, testosterone, cholesterol, phosphatidylserine, or phosphatidylcholine.
  • Linker refers to a group of atoms, e.g., 0-500 atoms, and may be comprised of the atoms or groups such as, but not limited to, carbon, amino, alkylamino, oxygen, sulfur, sulfoxide, sulfonyl, carbonyl, and imine.
  • the linker chain may also comprise part of a saturated, unsaturated or aromatic ring, including polycyclic and heteroaromatic rings wherein the heteroaromatic ring is an aryl group containing from one to four heteroatoms, N, O or S. Specific examples include, but are not limited to, unsaturated alkanes, polyethylene glycols, and dextran polymers.
  • the linker must not interfere with binding of the ligand to the target, or with the Diels-Alder reaction.
  • compositions and methods described herein include the use of Diels-Alder pairs that include a diene and a dienophile.
  • Diene e.g., a substituted tetrazine
  • a dienophile e.g., an alkene or alkyne
  • the inverse electron demand Diels-Alder cycloaddition reaction of a diene (e.g., a substituted tetrazine) with a dienophile e.g., an alkene or alkyne
  • a dienophile e.g., an alkene or alkyne
  • the dihydropyrazine product may undergo an additional oxidation step to generate the corresponding pyrazine.
  • tetrazine-linked fluorescent probes that react rapidly via an inverse electron demand Diels-Alder reaction to strained dienophiles such as trans- cyclooctene.
  • Diels-Alder reaction to strained dienophiles such as trans- cyclooctene.
  • the fluorescence intensity increases dramatically, in some cases by -20 fold.
  • This fluorescence "turn-on" significantly lowers background signal.
  • novel probes for live cell imaging of a ligand such as an antibody, small molecule, or other biomolecule modified with a strained alkene can provide a general method for labeling and imaging a ligand bound to a specific target.
  • this bioorthogonal inverse electron demand Diels-Alder reaction can be applied to an asymmetric tetrazine and a strained alkene, which is physically coupled to a small molecule, i.e. a trans-cyclooctens modified taxol analog and can be used to label and image this small molecule bound to intracellular tubules.
  • a small molecule i.e. a trans-cyclooctens modified taxol analog
  • the ligand e.g., an antibody, small molecule or other biomolecule
  • the dienophile e.g., an antibody, small molecule or other biomolecule
  • the ligand carries a functional group such as an amine, alcohol, carboxylic acid or ester, or other group of atoms on the ligand that can undergo a chemical reaction allowing attachment to the dienophile.
  • the dienophile or heterodienophile (which can be, e.g., an alkene, alkyne, nitroso, carbonyl or imine) possesses a reactive functional group for attachment to the ligand.
  • the reactive functional group on the ligand and/or dienophile undergoes a chemical reaction to form a link between the two.
  • the functional group on the ligand can be a non-natural nucleoside or amino acid, e.g., as described in Xie and Schultz, Nat. Rev. MoI. Cell Biol. 7:775-782 (2006); for example, the diene or dienophile can be incorporated into a non-natural amino acid as the side chain.
  • the diene or dienophile can be incorporated into a non-natural amino acid as the side chain.
  • One of skill in the art could readily synthesize such compounds.
  • the side chain of phenylalanine or tyrosine could be replace with a diene, e.g., a tetrazine; a dienophile, e.g., a trans-cyclooctene or norbornene, can replace the side chain of phenylalanine, tyrosine, isoleucine, leucine, or tryptophan.
  • a diene e.g., a tetrazine
  • a dienophile e.g., a trans-cyclooctene or norbornene
  • These new non-natural amino acids can then be used similarly to known non-natural amino acids, e.g., cells can be incubated in the presence of the new non-natural amino acids, and proteins can be produced that include the diene or dienophile already incorporated into the primary structure of the protein.
  • the diene can be a substituted tetrazine or other heteroaromatic ring system with at least two nitrogens adjacent to each other and which is a highly reactive participant in the inverse electron demand Diels-Alder reaction.
  • the diene is linked to the payload (which can be, e.g., a therapeutic agent, fluorescence dye, or other detectable agent) ( Figure 2).
  • the diene possesses a reactive group such as an amine, alcohol, carboxylic acid or ester, or other group that can undergo a chemical reaction with the reactive moiety on the payload to form a link between the two.
  • Dienes useful in the present disclosure include but are not limited to aromatic ring systems that contain two adjacent nitrogen atoms, for example, tetrazines, pyridazines, substituted or unsubstituted 1,2-diazines.
  • Other 1,2-diazines can include 1,2-diazines annelated to a second ⁇ -electron-deficient aromatic ring such as pyrido[3,4-d]pyridazines, pyridazino[4,5-d]pyridazines, and 1,2,4-triazines.
  • Pyridazines can also be fused with a five-membered heterocycle such as imidazo[4,5- d]pyridazines and l,2,3-triazolo[4,5-d]pyridazines.
  • the diene is an asymmetrical tetrazine as described herein, e.g., 3-(p-Benzylamino)- l,2,4,5-tetrazine ⁇ ).
  • Dienophiles useful in the present methods and compositions include but are not limited to carbon containing dienophiles such as alkenes or alkynes, or compounds containing nitroso, carbonyl or imine groups.
  • the dienophile is a strained dienophile.
  • a "strained" dienophile has a dihedral angle that deviates from the idealized 180 degree dihedral angle.
  • non-strained dienophiles e.g., sytrenes
  • electron rich electrophiles e.g., eneamines or vinyl ethers
  • Alkenes as used herein refers to an alkyl group having one or more double carbon-carbon bonds such as an ethylene, propylene, and the like. Alkenes can also include cyclic, ring-strained alkenes such as ⁇ r ⁇ r ⁇ -cyclooctene or norbornene carrying a double bond which induces significant ring strain and is thus highly reactive. Alkenes can also include more complex structures such as indoles and azaindoles, electron rich enamines. Heterodienophiles containing carbonyl, nitroso or imine groups can also be used. In some preferred embodiments, the dienophile is a trans-cyclooctenol, e.g., (E)-cyclooct-4-enol.
  • the methods and compositions described herein are useful for delivering a payload to a biological target.
  • the payload can be used, e.g., for labeling(e.g,. a detectable agent such as a fluorophore), or for therapeutic purposes (e.g., a cytotoxin or other therapeutic agent).
  • the payload is a therapeutic agent such as a cytotoxin, radioactive ion, or other therapeutic agents.
  • a cytotoxin or cytotoxic agent includes any agent that is detrimental to cells. Examples include taxol, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, actinomycin D, 1 -dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, puromycin, maytansinoids, e.g., maytansinol (see U.S. Pat. No. 5,208,020), CC-1065 (see U.S. Pat. Nos. 5,475,09
  • Radioactive ions include, but are not limited to iodine (e.g., iodine 125 or iodine 131), strontium 89, phosphorous, palladium, cesium, iridium, phosphate, cobalt, yttrium 90, Samarium 153 and praseodymium.
  • therapeutic agents include, but are not limited to, antimetabolites (e.g., methotrexate, 6-mercaptopurine, 6-thioguanine, cytarabine, 5-fluorouracil decarbazine), alkylating agents (e.g., mechlorethamine, thioepa chlorambucil, CC-1065, melphalan, carmustine (BSNU) and lomustine (CCNU), cyclothosphamide, busulfan, dibromomannitol, streptozotocin, mitomycin C, and cis-dichlorodiamine platinum (II) (DDP) cisplatin), anthracyclines (e.g., daunorubicin (formerly daunomycin) and doxorubicin), antibiotics (e.g., dactinomycin (formerly actinomycin), bleomycin, mithramycin, and anthramycin (AMC)), and anti-mitotic agents
  • detectable substances include various organic small molecules, inorganic compounds, nanoparticles, enzymes or enzyme substrates, fluorescent materials, luminescent materials, bioluminescent materials, chemiluminescent materials, radioactive materials, and contrast agents.
  • suitable enzymes include horseradish peroxidase, alkaline phosphatase, beta-galactosidase, or acetylcholinesterase;
  • suitable fluorescent materials include boron- dipyrromethene (BODIPY®), 4,4-difluoro-5,7-dimethyl-4-bora-3a,4a-diaza-s- indacene-3 -propionic acid (BODIPY® FL), 6-((4,4-difluoro-l,3-dimethyl-5-(4- methoxyphenyl)-4-bora-3a,4a-diaza-s-indacene-2-propionyl)amino)hexanoic acid, succinimidyl ester (
  • contrast agents e.g., contrast agents for MRI or ⁇ MR, for X- ray CT, Raman imaging, optical coherence tomogrpahy, absorption imaging, ultrasound imaging, or thermal imaging can be used.
  • contrast agents include gold (e.g., gold nanoparticles), gadolinium (e.g., chelated Gd), iron oxides (e.g., superparamagnetic iron oxide (SPIO), monocrystalline iron oxide nanoparticles (MIO ⁇ s), and ultrasmall superparamagnetic iron oxide (USPIO)), manganese chelates (e.g., Mn-DPDP), barium sulfate, iodinated contrast media (iohexol), microbubbles, or perfluorocarbons can also be used.
  • gold e.g., gold nanoparticles
  • gadolinium e.g., chelated Gd
  • iron oxides e.g., superparamagnetic iron oxide (SPIO), monocrystalline iron oxide nanoparticles (MIO ⁇ s), and ultrasmall superparamagnetic iron oxide (USPIO)
  • manganese chelates e.g., Mn-DPDP
  • the detectable agent is a non-detectable pre-cursor that becomes detectable upon activation.
  • examples include fluorogenic tetrazine- fluorophore constructs (e.g., tetrazine-BODIPY FL, tetrazine-Oregon Green 488, or tetrazine-BODIPY TMR-X) or enzyme activatable fluorogenic agents (e.g., PROSENSE (VisEn Medical))
  • the enzymatic label is detected by determination of conversion of an appropriate substrate to product.
  • ELISAs enzyme linked immunosorbent assays
  • IA enzyme immunoassay
  • RIA radioimmunoassay
  • Western blot analysis Western blot analysis.
  • the compositions also include a cell penetrating moiety or agent that enhances intracellular delivery of the compositions.
  • the compositions can include a cell-penetrating peptide sequence that facilitates delivery to the intracellular space, e.g., HlV-derived TAT peptide, penetratins, transportans, or hCT derived cell-penetrating peptides, see, e.g., Caron et al., (2001) MoI Ther.
  • compositions can also be formulated to include a cell penetrating agent, e.g., liposomes, that enhances delivery of the compositions to the intracellular space.
  • a cell penetrating agent e.g., liposomes
  • compositions and methods described herein can be used in a number of different scenarios in which delivery of a substance (the "payload") to a biological target is desired, for example delivery of detectable substances for detection of the target, or delivery of a therapeutic agent.
  • Detection methods can include both imaging in vitro and in vivo imaging methods, e.g., immunohistochemistry, bioluminescence imaging (BLI), Magnetic Resonance Imaging (MRI), positron emission tomography (PET), electron microscopy, X-ray computed tomography, Raman imaging, optical coherence tomography, absorption imaging, thermal imaging, fluorescence reflectance imaging, fluorescence microscopy, fluorescence molecular tomographic imaging, nuclear magnetic resonance imaging, X-ray imaging, ultrasound imaging, photoacoustic imaging, lab assays, or in any situation where tagging/staining/imaging is required.
  • the Diels-Alder coupling reaction as described herein can be used in place of standard avidin (or streptavidin)/biotin coupling procedures.
  • Many tissue types may contain endogenous biotin, so with the current standard biotin-based coupling procedures, an additional step to block the activity of the endogenous biotin may be necessary to eliminate unwanted non-specific background staining. This blocking step is not necessary if the compositions described herein are used.
  • the Diels-Alder coupling compositions described herein should also be applicable to any in situ hybridization (ISH) or fluorescence in situ hybridization (FISH) protocol for visualization of DNA or RNA in tissue or cell preparations in which the avidin (streptavidin)/biotin system is employed, e.g., Tyramide Signal Amplification FISH.
  • ISH in situ hybridization
  • FISH fluorescence in situ hybridization
  • the Diels-Alder coupling reaction as described herein can also be used as an alternative to secondary antibodies or in place of standard avidin (or streptavidin)/biotin coupling procedures during a western blot.
  • compositions described herein can be used to deliver therapeutic agents to cells or tissues, e.g., in living animals.
  • a therapeutic compound is attached to one half of the Diels-Alder pair, and a ligand that targets the desired cell or tissue is attached to the other half.
  • a ligand such as an antibody that recognizes a tumor cell is attached to one half, and the other half is linked to a payload comprising a cytotoxin, e.g., a toxin or radioactive substance.
  • cytotoxin e.g., a toxin or radioactive substance.
  • compositions and Methods of Administration include the manufacture and use of pharmaceutical compositions, which include compounds described herein as active ingredients. Also included are the pharmaceutical compositions themselves.
  • the compositions include a ligand that is specific for a tumor antigen or cancerous tissue, and the payload is a therapeutic agent such as a cytotoxin, radioactive agent, or other therapeutic agent useful in treating cancer.
  • compositions typically include a pharmaceutically acceptable carrier.
  • pharmaceutically acceptable carrier includes saline, solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration. Supplementary active compounds can also be incorporated into the compositions.
  • compositions are typically formulated to be compatible with its intended route of administration.
  • routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration.
  • solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
  • the parenteral preparation can be enclosed in ampoules, disposable syring
  • compositions suitable for injectable use can include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
  • suitable carriers include physiological saline, bacteriostatic water, Cremophor ELTM (BASF, Parsippany, NJ) or phosphate buffered saline (PBS).
  • the composition must be sterile and should be fluid to the extent that easy syringability exists. It should be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi.
  • the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyetheylene glycol, and the like), and suitable mixtures thereof.
  • the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
  • Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like.
  • isotonic agents for example, sugars, polyalcohols such as mannitol, sorbitol, sodium chloride in the composition.
  • Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent that delays absorption, for example, aluminum monostearate and gelatin.
  • Sterile injectable solutions can be prepared by incorporating the active compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
  • dispersions are prepared by incorporating the active compound into a sterile vehicle, which contains a basic dispersion medium and the required other ingredients from those enumerated above.
  • the preferred methods of preparation are vacuum drying and freeze-drying, which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
  • Oral compositions generally include an inert diluent or an edible carrier.
  • the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules, e.g., gelatin capsules.
  • Oral compositions can also be prepared using a fluid carrier for use as a mouthwash.
  • Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition.
  • the tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring.
  • a binder such as microcrystalline cellulose, gum tragacanth or gelatin
  • an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch
  • a lubricant such as magnesium stearate or Sterotes
  • a glidant such as colloidal silicon dioxide
  • the compounds can be delivered in the form of an aerosol spray from a pressured container or dispenser that contains a suitable propellant, e.g., a gas such as carbon dioxide, or a nebulizer.
  • a suitable propellant e.g., a gas such as carbon dioxide, or a nebulizer.
  • Systemic administration of a therapeutic compound as described herein can also be by transmucosal or transdermal means.
  • penetrants appropriate to the barrier to be permeated are used in the formulation.
  • penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives.
  • Transmucosal administration can be accomplished through the use of nasal sprays or suppositories.
  • the active compounds are formulated into ointments, salves, gels, or creams as generally known in the art.
  • compositions can also be prepared in the form of suppositories (e.g., with conventional suppository bases such as cocoa butter and other glycerides) or retention enemas for rectal delivery.
  • suppositories e.g., with conventional suppository bases such as cocoa butter and other glycerides
  • retention enemas for rectal delivery.
  • Liposomes e.g., as described in U.S. Patent No. 6,472,375
  • microencapsulation can also be used.
  • Biodegradable targetable microparticle delivery systems can also be used (e.g., as described in U.S. Patent No. 6,471,996).
  • the therapeutic compounds are prepared with carriers that will protect the therapeutic compounds against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
  • a controlled release formulation including implants and microencapsulated delivery systems.
  • Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid.
  • Such formulations can be prepared using standard techniques, or obtained commercially, e.g., from Alza Corporation and Nova Pharmaceuticals, Inc.
  • Liposomal suspensions (including liposomes targeted to selected cells with monoclonal antibodies to cellular antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Patent No. 4,522,811.
  • compositions can be included in a container, pack, or dispenser together with instructions for administration.
  • Preparative HPLC was performed on a Varian ProStar model 210 instrument equipped with a model 335 diode array detector, a model 701 fraction collector, and a Varian RPC 18 column (model A6002250X212) at a flow rate of 21 mL/minute.
  • solvent A comprised water with 0.1% TFA
  • solvent B comprised acetonitrile with 10% water and 0.1% TFA. All UV/vis spectra and kinetics experiments were recorded on an Agilent 8453 diode array UV/vis spectrophotometer.
  • the following example describes an exemplary method of synthesis of 3-(p- benzylamino)-tetrazine-VT680 conjugate.
  • reaction mixture After addition of the hydrazine, the reaction mixture became a thick, clear slurry with gas evolution. After stirring vigorously for 20 hours, the now yellow slurry was added to acetic acid (50 mL) and filtered through a glass frit.
  • the expected molecular weight of 3 was calculated to be approximately 1309 for [M+H] + from the molecular weight of 1 and the vendor supplied molecular weight of 1238 for the NHS ester of VT680 (VivoTag 680 is an amine reactive N-hydroxysuccinimide (NHS) ester of a
  • the following example describes an exemplary method of synthesis of 5-(4- (l,2,4,5-Tetrazin-3-yl)benzylamino)-5-oxopentanoic acid.
  • the following example describes an exemplary method of synthesis of 2-(6- Methyl- 1 ,2,4,5-tetrazin-3-yl)ethanol.
  • the following example describes an exemplary method of synthesis of 5-(6- Methyl- 1 ,2,4,5-tetrazin-3-yl)pentan- 1 -amine hydrochloride.
  • the following example describes an exemplary method of synthesis of 5- (l,2,4,5-Tetrazin-3-yl)pentan-l-amine hydrochloride.
  • the following example describes an exemplary method of synthesis of 2-(6- (Pyrimidin-2-yl)- 1 ,2,4,5-tetrazin-3-yl)ethanol.
  • (is)-cyclooct-4-enol was synthesized from (Z)-cyclooct-4-enol using a modification of a previously reported protocol (Royzen, M. et al. J. Am. Chem. Soc. 2008, 130, 3760-3761). Briefly, 1 gram of cyclooctenol (2) and 1.1 g methyl benzoate sensitizer was added to 250 mL solvent (9: 1 Ethe ⁇ Hexanes) in a 500 mL quartz reaction vessel (Southern New England Ultraviolet Company). No attempt to degas the solution was made.
  • the vessel was irradiated with 254 nm light in a Rayonet RPR-100 UV reactor (Southern New England Ultraviolet Company) under constant stirring. At 30 minute intervals, the irradiation was stopped and the entire solution was passed through a column packed with silver nitrate (10%) impregnated silica (commercially available from Aldrich). The solution that passes through was then transferred back into the quartz flask and irradiation was continued. After 6 hours the irradiation was stopped and the silica was added to a solution of ammonium hydroxide and stirred for 5 minutes after which ether was added and stirring continued for 5 more minutes.
  • Tetrazines conjugated to highly charged carbocyanine-based near-IR emitting fluorophores are useful in extracellular labeling.
  • benzylamino tetrazine was conjugated to the succinimidyl esters of visible light emitting boron-dipyrromethene (BODIPY) dyes.
  • BODIPY dyes are uncharged and lipophilic and for these reasons have seen use in intracellular applications (Cole et al, 2000, J Microsc, 197, 239-49; Farinas and Verkman, 1999, J Biol Chem, 274, 7603-6; Miller et al., 2006, Nat Protoc, 1, 824-7; Takahashi et al., 2002, Diabetes, 51 Suppl 1, S25-8; Viht et al., 2003, Bioorg Med Chem Lett, 13, 3035-9).
  • Tetrazines are well know to be an electron-poor class of heterocycles, hence their utility in inverse-electron demand cycloadditions.
  • PET quenching would be reminiscent of the well known quenching of fluorophores by electron poor nitrated compounds (Goodpaster and McGuffin, 2001, Anal Chem, 73, 2004-11; Kim et al, 2004, JAm Chem Soc, 126, 452-3).
  • these fluorogenic compounds can be formed from commercially available cores and the tetrazine appears to be a strong enough quencher that it does require intimate connection to the fluorophore and can achieve a quenching effect even when separated by aliphatic spacers.
  • Example 16 Tracking and Imaging a Small Molecule (Taxol®)
  • fluorogenic probes could have a myriad of applications, one use that would immediately benefit from a fluorogenic probe is the detection of small molecules inside live cells.
  • fluorogenic tetrazines would be relevant for imaging intracellular molecular targets, we chose dienophile-modified paclitaxel (Taxol®) as a test system.
  • Taxol® was selected because of its tremendous clinical impact, the large body of prior work that serves as reference, and because of its well studied ability to stabilize microtubules, providing a well-defined intracellular structure to image (Evangelio et al, 1998, Cell Motil Cytoskeleton, 39, 73-90; Guy et al, 1996, Chem Biol, 3, 1021-31; Manfredi et al., 1982, J Cell Biol, 94, 688-96; Nicolaou et al., 1994, Angew. Chem. Int. Ed., 33, 15-44; Rowinsky et al., 1990, J. Natl.
  • trans-cyclooctQnQ taxol rapidly reacts with our tetrazine probes forming isomeric dihydropyrazine products, which can be detected by conventional means, such as LC-MS. Testing Trans-Cyclooctene Taxol Analog in Tubulin Polymerization Assay
  • Taxol trans-cyclooctQUQ induced tubule bundles could be visualized by subsequent staining with tetrazine fluorophore probes such as tetrazine-BODIPY FL yielding brightly fluorescent tubule structures that could be imaged by fluorescent microscopy (Figure 6c).
  • PtK2 rat kidney cells were incubated in cell media containing 1 ⁇ M ⁇ r ⁇ r ⁇ -cyclooctene taxol for 1 hour at 37°C. After washing with media three times, the cells were exposed to media containing 1 ⁇ M tetrazine- BODIPY FL for 20 minutes at room temperature. The cells were then washed and imaged on a confocal microscope. Confocal microscopy of the PTK2 rat kangaroo cell after treatment with l ⁇ M trans-cyclooctene-taxol followed by l ⁇ M tetrazine- BODIPY FL showed that tubular structures were clearly stained.
  • Taxol® is known to bind the microtubular networks of cells and there have been several reports of fluorescent taxol derivatives that can be used to image microtubular networks (Evangelio et al., 1998, Cell Motil Cytoskeleton, 39, 73- 90; Guy et al., 1996, Chem Biol, 3, 1021-31; Souto et al., 1995, Angew. Chem. Int. Ed., 34, 2710-2712).
  • Epoxides like the one in the trans-cyclooctene product are reactive with nucleophiles such as amines and thiols and are used as is for attachment of the trans- octene to other biomolecules.
  • alkyl-thiols (3-mercaptopropanoic acid, 2-(A- mercaptophenyl)acetic acid, etc.) or other nucleophiles containing additional functional groups such as, but not limited to carboxylic acids may be coupled to (E)- 9-oxabicyclo[6.1.0]non-4-ene via nucleophilic attack and subsequent ring opening of the epoxide functionality of (is)-9-oxabicyclo[6.1.0]non-4-ene to yield corresponding carboxylic acid functionalized ⁇ r ⁇ r ⁇ -cyclooctenes where the carboxylic acid functionality is linked to the cyclooctene via a chemically stable thioether bond.
  • (is)-2-(4-(8-hydroxycyclooct-4-enylthio)phenyl)acetic acid (as shown in the lower reaction path in the scheme above) is prepared by the reaction of 2-(4-mercaptophenyl)acetic acid (21.0 mg, 0.125 mmol) with (E)-9- oxabicyclo[6.1.0]non-4-ene (15.5 mg, 0.125 mmol) in a mixture of acetonitrile (100 ⁇ L) and water (200 ⁇ L) with 20 mol% ZnCl 2 as catalyst. After stirring the biphasic mixture for 1 hour, the product is isolated by removal of the solvents under vacuum. LRMS-ESI [M+H] + calcd. for Ci 6 H 21 O 3 S + : 293.12, found: 293.1.
  • This nucleophilic attack is adaptable to preparing amine-modified trans- cyclooctenes via nucleophilic attack of ammonia (or primary and secondary amines) on the epoxide of (E)-9-oxabicyclo[6.1.0]non-4-ene.
  • HRP horseradish peroxidase
  • succinimidyl esters of the dienophile or tetrazine coupling components are labeled with the succinimidyl esters of the dienophile or tetrazine coupling components.
  • HRP in aqueous buffer is treated with the succinimidyl ester of 5-(4-(l,2,4,5-tetrazin-3- yl)benzylamino)-5-oxopentanoic acid (prepared by treatment of 5-(4-(l,2,4,5-tetrazin- 3-yl)benzylamino)-5-oxopentanoic acid with disuccinimidyl carbonate in the presence of pyridine) to form tetrazine modified HRP (HRP -tetrazine).
  • Antibodies such as, but not limited to, trastuzumab, were labeled with the succinimidyl esters of the dienophile or tetrazine coupling components.
  • Trastuzumab in aqueous buffer was treated with a 30 molar excess of the succinimidyl ester of ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid) (prepared by treatment of ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid) in acetonitrile with 1.1 equiv of disuccinimidyl carbonate and 1 equiv of pyridine) to form ((1S,2S,4S)- bicyclo[2.2. l]hept-5-en-2-yl acetic acid) modified trastuzumab (mAb-norbornene).
  • Example 21 Pretargeting Methods Using an anti-EGFR Antibody
  • An anti-EGFR antibody cetuximab
  • trans-cyclooctene succinimidyl carbonate was labeled with trans-cyclooctene succinimidyl carbonate and used for pretargeting experiments as follows. Labeling Antibody with trans-cyclooctene
  • Cetuximab (ImClone 2 mg/mL) was purchased and the solvent exchanged for 0. IM NaHCO 3 buffered at pH 8.5 with a final concentration of 7 mg/mL. To 200 uL of this stock solution was added 10 uL of DMF. (E)-cyclooct-4-enyl 2,5- dioxopyrrolidin-1-yl carbonate was dissolved in anhydrous DMF to make a 40 mM stock solution. For conjugation, the appropriate excess of amine reactive trans- cyclooctene in DMF was aliquoted into the antibody solution, vortexed, and reacted overnight at 4 0 C.
  • trans-cyclooctene modified antibody was physically absorbed onto polystyrene by immersing the surfaces in a 0.1 mg/mL solution of antibody in PBS for 3 hours. After numerous washes with PBS, the surface was exposed to 750 nM tetrazine VT680 in PBS at 37° C. After 5 minutes, the tetrazine solution was removed and the surface washed 3 times with PBS. The fluorescence due to the VT680 dye was measured on a fluorescence plate reader (Tecan Safire 2) and corrected for background fluorescence. The surface was again exposed to the tetrazine solution and the entire process repeated at 10, 15, 30, and 60 minutes.
  • the human lung adenocarcinoma epithelial cell line A549 was selected for all experiments due to its mid-level over-expression of EGFR.
  • the cell line was maintained in a standard ATCC formulated F-12K media supplemented with 10% fetal bovine serum and 5% penicillin/streptomycin.
  • EGFP labeling of the cell line was done using a third-generation lentiviral vector system.
  • 293T cells were transfected using lipofectamine 2000 in a subconfluent 10-cm dish with the vector pCCLsin.PPT.hPGK (10 ug), into which EGFP had been cloned, as well as pMDLg/p packaging (7 ug) and VSV-G envelope encoding pMD.G (5 ug) plasmids. These plasmids were obtained from Rafaella Sordella at the MGH Center for Cancer Research and Luigi Naldini at the San Raffaele Telethon Institute for Gene Therapy. Viral supernatant was collected after 48 hours, filtered with a 0.45 micron syringe filter, and stored at -80 0 C.
  • the A549 cell line was infected in subconfluent wells of 24-well plates, using 300 uL of virus in 1 mL of F-12K culture media with 10% fetal calf serum. This protocol yielded an infection rate in excess of 80% (determined by visual assessment using fluorescence microscopy). EGFP-negative cells were removed using a modified 5- laser Becton-Dickinson FACSDiVa with standard techniques. Confocal Microscopy Cells were grown on break away glass chamber slides and washed six times after administering either imaging agent. A multichannel upright laser-scanning confocal microscope (FVlOOO; Olympus) was used to image live cells with a 6OX water immersion objective lens.
  • FVlOOO upright laser-scanning confocal microscope
  • Image collection and fluorophore excitations with lasers at 488nm (EGFP), 543nm (AF555), and 633nm (VT680) were done serially to avoid cross talk between channels.
  • Data were acquired with Fluoview software (version 4.3; Olympus) and image stacks were processed and analyzed with ImageJ software (version 1.41, Bethesda MD).
  • the concentration of the tetrazine- VT680 label was lowered to 50 nm to enable observation of the covalent modification in real time.
  • the images were taken during continuous imaging of the cycloaddition of the tetrazine- VT680 to the pretargeted trans-cyclooctene on live cancer cells in 100% FBS. Tetrazine- VT680 first became visible as it reacted and concentrated on the surface of cells; at later times, punctate spots within the cell were visible as tetrazine- labeled cetuximab was internalized.
  • the loading density of the reactive transcyclooctene on the targeted antibodies was increased. A greater number of reactive sites per antibody should lead to more fluorophore per antibody after labeling and thus result in signal amplification.
  • To vary the trans-cyclooctene loading we exposed cetuximab to different molar excesses of the amine-reactive trans-cyclooctene. The conjugates were modified with tetrazine- VT680, and the resulting fluorochrome absorbance was used to estimate the number of reactive trans- cyclooctene units per antibody.
  • Confluent A549 cells were suspended using 0.05% Tryspin/0.53 mM EDTA, washed by centrifugation with PBS containing 2% FBS (PBS+), and 2.5x105 cells were added to microcentrifuge tubes.
  • Cetuximab antibody with the following modifications was then added at 10 ug/ml concentration in 100 uL PBS+: none (control), 1 trans-cyclooctene per antibody, 3 trans-cyclooctene per antibody, 5 trans-cyclooctene per antibody, 6 trans-cyclooctene per antibody.
  • VT680 and DyeLight-488 fluorescence were assessed using an LSRII flow cytometer (Becton Dickinson) and analyzed using Flow Jo software.
  • this provides a highly sensitive technique for the covalent labeling of live cancer cells on the basis of the cycloaddition of a tetrazine to a highly strained trans-cyclooctene.
  • Example 22 Pretargeting Methods Using an anti-HER2/neu Antibody
  • trastuzumab Herceptin
  • Her2/neu growth factor receptors Her2/neu growth factor receptors
  • Preparative HPLC was performed on a Varian ProStar model 210 instrument equipped with a model 335 diode array detector, a model 701 fraction collector, and a Varian RPC 18 column (model A6002250X212) at a flow rate of 21 mL/minute.
  • solvent A consists of water with 0.1% TFA
  • solvent B is composed of acetonitrile with 10% water and 0.1% TFA.
  • All UV/vis spectra and kinetics experiments were recorded on an Agilent 8453 diode array UV/vis spectrophotometer. Pseudo first order rate constants from all kinetics experiments were calculated using the Agilent UV/vis Chemstation software package Rev. A.10.01.
  • Norbornene carboxylic acid ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid) was stirred for three hours with 1.1 equivalents of disuccinimidyl carbonate in acetontrile using 1 equivalent of pyridine as base. After reaction, solvent and base were removed by rotary evaporation and the crude norbornene succinimidyl ester with Nhydroxysuccinimide side product was recovered.
  • Commercially purchased humanized anti-HER2/neu antibody trastuzumab (Genentech, San Francisco, CA) in 0.
  • IM sodium bicarbonate buffer pH 8.2 was incubated for three hours at room temperature with a 5 molar excess of 5-(and-6)-carboxytetramethylrhodamine, succinimidyl ester (Invitrogen) and a 30 molar excess of crude norbornene succinimidyl ester.
  • the antibody was then isolated and washed by centrifuge purification and stored in PBS buffer. Control antibody was modified in an identical manner but excluding the norbornene NHS.
  • SKBR-3 human mammary carcinoma cell lines were maintained in complete McCoy's medium. Cells were incubated at 37 oC with 200 nM modified trastuzumab for 30 minutes and then washed twice with 10% fetal bovine serum (FBS) in Hanks balanced salt solution (HBSS). Tetrazine labeling was performed by incubating the cells for 30 minutes at 37 oC in 10% FBS/HBSS containing 50 ⁇ M of tetrazine- VT680. Cells were then washed twice with 10% FBS/HBSS and imaged with by fluorescence microscopy.
  • FBS fetal bovine serum
  • HBSS Hanks balanced salt solution
  • Nanoparticles containing amino functionality are labeled with the succinimidyl esters of the dienophile or tetrazine coupling components.
  • Amine modified cross-linked iron oxide (CLIO-NH 2 ) nanoparticles are functionalized with the succinimidyl esters of the dienophile component by treatment of the CLIO-NH 2 with the succinimidyl ester of ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid) in aqueous buffer followed by purification by centrifugal filtration or size exclusion chromatography.
  • Example A The compositions described herein are useful in immunohistochemistry methods.
  • Example A The compositions described herein are useful in immunohistochemistry methods.
  • the tissue section is incubated with the dienophile modified secondary antibody (mAb-norbornene) (prepared via a procedure analogous to the example above where trastuzumab is the antibody) After washing 3 times for 5 minutes each with PBS, the tissue section is incubated with HRP-tetrazine (as prepared in the example above) in PBS buffer for 30 minutes to conjugate the secondary antibody to the HRP-tetrazine via the inverse electron demand Diels-Alder coupling reaction. The tissue section is then washed 3 times for 5 minutes each to remove unconjugated HRP-tetrazine.
  • the dienophile modified secondary antibody mAb-norbornene
  • HRP-tetrazine as prepared in the example above
  • tissue section is incubated with dilute H 2 O 2 (typically 0.5 to 10 ⁇ M) and the appropriate chromogenic peroxidase substrate such as, but not limited to, diaminobenzidine (DAB) or 3-amino-9-ethyl carbazole (AEC) until the desired staining intensity is obtained.
  • DAB diaminobenzidine
  • AEC 3-amino-9-ethyl carbazole
  • the tissue section is then washed 3 times for 5 minutes each to remove unconjugated HRP-tetrazine.
  • the tissue section is incubated with dilute H 2 O 2 (typically 0.5 to 10 ⁇ M) and the appropriate chromogenic peroxidase substrate such as, but not limited to, diaminobenzidine (DAB) or 3-amino-9-ethyl carbazole (AEC) until the desired staining intensity is obtained.
  • DAB diaminobenzidine
  • AEC 3-amino-9-ethyl carbazole
  • Example A The tissue section is first incubated with norbornene or ⁇ r ⁇ ws-cyclooctene labeled primary antibody (as prepared in the example above) in PBS buffer for 30 minutes. Unbound and non-specifically bound antibody is removed by washing with PBS 3 times for 5 minutes each. After washing, the tissue section is incubated with a tetrazine-fluorophore conjugate (such as, but not limited to tetrazine-VT680 (as prepared in a previous example)) in PBS buffer for 30 minutes to covalently couple the fluorophore to the primary antibody. The tissue section is then washed 3 times for 5 minutes each to remove unconjugated tetrazine-VT680. The procedure is completed by washing with water and mounting of the tissue section.
  • a tetrazine-fluorophore conjugate such as, but not limited to tetrazine-VT680 (as prepared in a previous example)
  • Example B The tissue section is first incubated with unlabeled primary antibody in PBS buffer for 30 minutes. Unbound and non-specifically bound antibody is removed by washing with PBS 3 times for 5 minutes each. After washing, the tissue section is incubated with 4% blocking serum in PBS for 30 minutes using serum from the species in which the secondary antibody is made. The diluted serum solution is decanted and the tissue section is washed 3 times for 5 minutes each with PBS. Then the tissue section is incubated with the dienophile modified secondary antibody (mAb-norbornene) (prepared via a procedure analogous to the example above where trastuzumab is the antibody) for 30 minutes.
  • mAb-norbornene dienophile modified secondary antibody
  • tissue section After washing 3 times for 5 minutes each with PBS, the tissue section is incubated with a tetrazine-fluorophore conjugate (such as, but not limited to tetrazine-VT680 (as prepared in a previous example)) in PBS buffer for 30 minutes to covalently couple the fluorophore to the primary antibody.
  • a tetrazine-fluorophore conjugate such as, but not limited to tetrazine-VT680 (as prepared in a previous example)
  • PBS buffer for 30 minutes to covalently couple the fluorophore to the primary antibody.
  • the tissue section is then washed 3 times for 5 minutes each to remove unconjugated tetrazine-VT680.
  • the procedure is completed by washing with water and mounting of the tissue section.
  • Norbornene or ⁇ r ⁇ r ⁇ -cyclooctene labeled primary antibody (as prepared in the example above) is incubated with a tetrazine-fluorophore conjugate (such as, but not limited to tetrazine-VT680 (as prepared in a previous example)) in PBS buffer for 30 minutes to covalently couple the fluorophore to the primary antibody. If necessary this solution may be purified by centrifugal filtration. Otherwise, the crude fluorescently labeled primary antibody solution is incubated with the tissue section for 30 minutes in PBS. After incubation, unbound, non-specifically bound antibody, and any remaining tetrazine-fluorophore are removed by washing with PBS 3 times for 5 minutes each.
  • a tetrazine-fluorophore conjugate such as, but not limited to tetrazine-VT680 (as prepared in a previous example
  • Example 26 Tyramide Signal Amplification (TSA) Immunofluorescence
  • TSA Tyramide Signal Amplification
  • the tissue section is incubated with the dienophile modified secondary antibody (mAb-norbornene) (prepared via a procedure analogous to the example above where trastuzumab is the antibody) After washing 3 times for 5 minutes each with PBS, the tissue section is incubated with HRP-tetrazine (as prepared in the example above) in PBS buffer for 30 minutes to conjugate the secondary antibody to the HRP-tetrazine via the inverse electron demand Diels-Alder coupling reaction. The tissue section is then washed 3 times for 5 minutes each to remove unconjugated HRP-tetrazine.
  • the dienophile modified secondary antibody mAb-norbornene
  • HRP-tetrazine as prepared in the example above
  • the tissue section is incubated with dilute H 2 O 2 (typically 0.5 to 10 ⁇ M) and the appropriate tyramide conjugated fluorophore substrate such as, but not limited to, fluorescein tyramide, tetramethylrhodamine tyramide, or Cy5 tyramide. After incubation for the desired time, the procedure is completed by washing with water or PBS 3 times for 5 minutes each to remove any excess fluorophore-tyramide and mounting of the tissue section.
  • dilute H 2 O 2 typically 0.5 to 10 ⁇ M
  • the appropriate tyramide conjugated fluorophore substrate such as, but not limited to, fluorescein tyramide, tetramethylrhodamine tyramide, or Cy5 tyramide.
  • This procedure is also be used for electron microscopy where the fluorophore- tyramide component is replaced by a gold nanoparticle-tyramide conjugate.
  • the tissue section is then washed 3 times for 5 minutes each to remove unconjugated HRP-tetrazine.
  • the tissue section is incubated with dilute H 2 O 2 (typically 0.5 to 10 ⁇ M) and the appropriate tyramide conjugated fluorophore substrate such as, but not limited to, fluorescein tyramide, tetramethylrhodamine tyramide, or Cy5 tyramide.
  • the procedure is completed by washing with water or PBS 3 times for 5 minutes each to remove any excess fluorophore-tyramide and mounting of the tissue section. This procedure could also be used for electron microscopy where the fluorophore-tyramide component is replaced by a gold nanoparticle-tyramide conjugate.
  • tissue section is then washed 3 times for 5 minutes each with PBS to remove unbound and non-specifically bound HRP secondary antibody.
  • the tissue section is incubated with dilute H 2 O 2 (typically 0.5 to 10 ⁇ M) and tetrazine-tyramide or dienophile-tyramide constructs (prepared by coupling of the appropriate N-hydroxysuccinimidyl ester modified tetrazine or dienophile with tyramine) such as 5-(4-(l,2,4,5-tetrazin-3-yl)benzylamino)-5- oxopentanoic acid-tyramide.
  • dilute H 2 O 2 typically 0.5 to 10 ⁇ M
  • tetrazine-tyramide or dienophile-tyramide constructs prepared by coupling of the appropriate N-hydroxysuccinimidyl ester modified tetrazine or dienophile with tyramine
  • tissue section is then treated with a fluorophore-dienophile conjugate (prepared by reaction of the N- hydroxysuccinimidyl ester of ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid) or any trans-cyclooctem analog with the desired amine modified fluorophore, such as, but not limited to fluorescein, tetramethylrhodamine, or Cy5). After incubation for the desired time, the procedure is completed by washing with water or PBS 3 times for 5 minutes each to remove any excess fluorophore-dienophile and mounting of the tissue section.
  • a fluorophore-dienophile conjugate prepared by reaction of the N- hydroxysuccinimidyl ester of ((lS,2S,4S)-bicyclo[2.2.1]hept-5-en-2-yl acetic acid
  • any trans-cyclooctem analog such as, but not limited to
  • This procedure is also used for electron microscopy where the fluorophore- dienophile component is replaced by a gold nanoparticle-dienophile conjugate.
  • the membrane is incubated blocking buffer for 30 minutes.
  • the appropriate dilution of the primary antibody previously modified with ⁇ r ⁇ r ⁇ -cyclooctene (prepared as dscribed in example 20), is then added to the solution, which is able to bind to its specific protein on the membrane.
  • the membrane is incubated in this solution until a sufficient level of antibody binding is obtained.
  • a tetrazine-fluorophore conjugate (prepared as described in examples 1 and 2), which undergoes inverse electron demand Diels- Alder cycloaddition to the trans-cyclooctens modified primary antibody, is incubated with the membrane for the appropriate time. After washing three times with PBS or water, the fluorescently tagged proteins on the membrane may be visualized by standard fluorescnece methodologies.
  • Example B
  • the membrane is incubated with blocking buffer for 30 minutes to block non-specific sites on the membrane.
  • the appropriate dilution of the primary antibody previously modified with ⁇ r ⁇ r ⁇ -cyclooctene (prepared as dscribed in example 20), is then added to the solution, which is able to bind to its specific protein on the membrane.
  • the membrane is incubated in this solution until a sufficient level of antibody binding is obtained.
  • a tetrazine-HRP conjugate (prepared as described in example 19), which undergoes inverse electron demand Diels-Alder cycloaddition to the ⁇ r ⁇ r ⁇ -cyclooctene modified primary antibody, is incubated with the membrane for the appropriate time.
  • the membrane After washing three times with PBS or water (for 5-15 minutes each), the membrane is incubated with H 2 O 2 (typically 0.5 to 10 ⁇ M) and the appropriate tyramide conjugated fluorophore substrate such as, but not limited to, fluorescein tyramide, tetramethylrhodamine tyramide, or Cy5 tyramide. After incubation for the desired time, the membrane is washed with PBS or water 3 times (for 5-15 minutes each) to remove non-coupled fluorophore-tyramide and the membrane is imaged by standard fluorescence procedures.
  • H 2 O 2 typically 0.5 to 10 ⁇ M
  • the appropriate tyramide conjugated fluorophore substrate such as, but not limited to, fluorescein tyramide, tetramethylrhodamine tyramide, or Cy5 tyramide.
  • the fluorophore can be replaced with a chemiluminescent substrate such as, but not limited to luminol.
  • a chemiluminescent substrate such as, but not limited to luminol.

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Abstract

La présente invention concerne des compositions et des procédés employant une réaction de cycloaddition de Diels-Alder de demande inverse d'électrons bioorthogonale pour l'administration rapide et spécifique par liaison covalente d'une « charge utile » à un ligand lié à une cible biologique.
PCT/US2009/062958 2008-10-31 2009-11-02 Compositions et procédés d'administration d'une substance à une cible biologique Ceased WO2010051530A2 (fr)

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CN200980153250.6A CN102271712B (zh) 2008-10-31 2009-11-02 用于将物质递送至生物靶标的组合物和方法
EP19193586.5A EP3622968A1 (fr) 2008-10-31 2009-11-02 Compositions et procédés d'administration d'une substance à une cible biologique
US13/761,838 US20130302246A1 (en) 2008-10-31 2013-02-07 Compositions and methods for delivering a substance to a biological target

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US20130302246A1 (en) 2013-11-14
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